<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
  //1.无参无返回值
  function f1() {
      console.log("f1");
  }
  //调用方法
  f1();
  //2.有参无返回值
  function f2(name, age) {
      console.log(name + ":" + age);
  }
  f2("张三", 18);
  //3.无参有返回值
  function f3() {
      return "我是返回值!"
  }
  let info = f3();
  console.log(info);
  //4.有参有返回值
  function f4(x, y) {
      return x * y;
  }
  let result = f4(5, 9);
  console.log(result);
  // 第二种声明方法的方式
  let f5 = function(name, age) {
      console.log(name + ":" + age);
  }
  f5("吕布", 30);
  // 第三种声明方法的方式
  let f6 = new Function("name", "age", "console.log(name + ':' + age)");
  f6("貂蝉", 33);
</script>
</body>
</html>